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  <h3>图片在底部(card-img-bottom)</h3>
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      <h4 class="card-title">梅花</h4>
      <p class="card-text">当年腊月半，已觉梅花阑。不信今春晚，俱来雪里看。树动悬冰落，枝高出手寒。早知觅不见，真悔著衣单。</p>
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